Stay-bolt.



W. JENKINS.

STAY BOLT.

APPLICATION FILED AUG.24, I917.

Patented Apr. 15,1919.

Arm/Mays.

s s rm OFICE.

WESTON JENKINS, OF ROME, NEW YORK, ASSIGNOR TOBOME IRONIVIILLS, INCL, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

STAY-BOLT.

Specification of Letters Patent;

Patented Apr. 15, 1919.

Application filed August 24, 1917. Serial No. 187,932.

Improvements in Stay-Bolts, of which the following is a specification.

This invention has reference to an improved stay-bolt construction such as is commonly used in locomotive boilers and an improved method of making the same.

The first of theobjects of this invention is the provision of a stay-bolt which will have a maximum of strength with a minimum of material and'which will in fact for a given diameter present a bolt of much greater strength than the stay-bolt made according to the usual manner. Another object of the invention is the provision of an improved cushioning means between the stay-bolt and the fire box sheet in which it is mounted so that it will withstand a much more extreme amount of vibration and strain than the ordinary form of construction and will have in its integral structure a limited capacity of fiexure such as will avoid the necessity of using what are known as flexible stay-bolts.

Another object of this inventionis the provision of a composite stay-bolt constructed preferably of an iron core or central part and provided withrseat ferrules preferably of copper or other similar metal which will facilitate the introduction of the bolt into the fire box sheet or sheets and will: at the same time serve to provide a non-corrosive and partial cushioning protection for the harder metal of the core of the; bolt.

Another object of this invention is the provision of a bolt in which the length of the same] substantially from. inner to outer sheet andfor a portion at least of the distance within the sheets will be free of the destructive action of threads whereby the core portion of the bolt will not be so liable to fracture from vibratory strains.

Another object of the invention is the provision of 'abolt which vwill-have an increased measure of integralflexibility and yet at the same time may provide a continuous aperture from end to end of the bolt so as to allow ready inspection of the same without the necessity of the removal of any caps or other parts which render the inspection" of ing drawings, wherein Y certain wellknown types of flexible bolts a matter of considerable difliculty.

The above, as well as suchother objects as may hereinafter appear, I attain by means of a construction which I have illustrated in preferred form in the accompany- Figure 1 is a sectional view showing one tion within the fire box sheet and outer or wrapper sheet and before ithas beenriveted in place, while Fig. 2sh0ws the bolt in final applied condition. 1

Referring now more particularly to Fig. 1, it will be seen that I have therein indicated the fire box sheet 3, an outer sheet 4, and a stay-bolt which is composed of a central part or bar 5, preferably of wrought iron, and having an aperture in the center gage the bar 5 with certain parts forced into depressions as indicated at"8arranged at intervals around the bar-to serve to hold the ferrule against endwise or rotary motion. The extent of the projection of the bar 5 inside of the ferrule 7 is made sufficient so that when the end ofithe stay-bolt is riveted over, as indicated in Fig, 2 at 9, it will project beyond the outer periphery of the ferrule 7 and afford strengthenin engag'ement in the plane of the metal 0 the sheet 3 so that the soft character of the metal in the ferrule 7 will not permit the bar 5 to be pulled out by the heavy pressure which it has to sustain.v v r,

The ferrule? is made of a sufficient thickness to provide ample room for the threads 10 which engage the sheet-3 and alsoto permit some flow of the copper or other soft metal outwardly during the riveting of the part 9 as a kind of seal or washer between the part 9 and the sheet 3 which insures a more perfect joint.

At the other end of the bar 5 I provide another ferrule 11 of copper or like material 'which has a flanged portion'12- and a thread of my improved stay-bolts in initial posi- 13 toengage withthe sheet a, but which upon its inner surface embraces the bar for most of its length without any thread as indicated-at 14c, there being an overlap how- 5 ever, at such as will forni-erigagehment with perhaps a couple of turns of the thread 16 on the outer end of the bar 5 which-extends beyond the sheet 1. Engaging the thread'l6 I provide a nutl'? which haspref- 10 erably a ball and socket-bearing against the outer surface of the copper ferrule 11 and will serve to pinch the flange 12 between the nut 17 and thersheet 4.

I-he stay bolt; is n ade-inthe first instance 1 5 with; a: downwardly projecting squared end 71 8 or-:other suitable means-for screwing it into -place andfsuch end after rthe bolt :is

properly placed isto' be-cut off. and the outer surface riveted over as "at 19,; leaving a 20continuous tubular "passagevthroughout the lengthof; the stay-bolt and providing a construction vwhich will be tight .at all points rand which-ith-roughontf'theilength of the: part which has to carry the strainsavillzbewithout 2 5 any .-thre'ads and will: stand one-this account and beoause ofiits protection by thei'copper ferrules a very,- much "larger amount of vibratory andsother undue-strains. Ihe fa'ct ithat'the zouter'ssurface vof the bar 5 islleft with its I-O1TlglHa13SOalG fOTHliLtlOIl also adds @to :its edurabilitynand reduces the liability to corrosion where-rit lS:6XPOSBCl-zt-O contact with the water between theisheets3 and' 't.

It willrbe seen that byireason 'oflthe chartacteraandlklispositionrof the-aperture 6 a tool ;-1nay:be pnshed entirely through the stay-bolt -.-t011'11;k6i$1118- that the passage therein is open 2311(1 inzcondition to properly *register any fracture which may occur, and 'this opera- 40 :tion roan be accomplishedin 1 this structure without the z'removal zor disarrangement 1 of any eaps oreother -parts whatever and also .frornrthe; outside of the'fire box. :It will -also-bewobservedr that if, fI'OIH'illIl'dllB strains, {some rleak should start #between K the copper fe-rru-les andth'e sheetswor either of them, the: nut 1327 can be; slightlyntightened and the zlea'k very readilystopped.

In :actual vibratory tests which I have' gmade of'structures constructed accordance With @the :above described improvement, I

- have ufound thatthe durability of the bar '5 by a the arrangement of the copper ferrule without the threaded engagement of the sarne with the bar 5 at its pointo'f "flexure ls -in-ereased many ti-mes over as compared with :sstayeb'olts of :ordinary :eonstruction 3 in whichrthe bar itself:- is threaded: on 'the outer surface {and forms engagement with the r threaded :interior of the aperture in the isheetydn which last nientioned arrangement not only is the toughness rand protective ae'fi ect of the :Scale surface of the bar lost l bfltnas'ristvll cknown, the base of -the thread 6 5 {groove tends in itself itoi present a point ithat initiates the spread of a transverse fracture. i

I have found by experiments that the presence of =the ceopper arranged as shown will provide for quite an appreciable lateral working of the two sheets without tendency "to 'fracture the metal of the bolt proper which being of wrought iron has a greater degree of strength than the all-'copper'stayholt-rwh-ichds ineeommon use abroad. Ex-

amination of the drawing will show that the iron of the boltzisqiotqthreadedaatvanyipoint *where :it =is :asubject to flexing-strains and '.--exp e-nience has demonstrated that .sWhen ::given ;a "vibratory test riron' which-'phas snot ibeen inachined willstandzatfarrgreatennumher rof vibrations thanziron which has (been subj ected to the rnachinin'g, action dfea I outtingztool. As-staybolt; .mannfaetu'redEin accordance with any invention is decidedly :expensiverto eonstrnct when :compared rWith the all :e0pper;sstayrbolt, referred to or-{with tether-types of ,so aealledxflexible stay-bolts in use intheUnitedfitates. 7

l claim 1 7 LA stay-bolt havingia core-iofzhard metal rand a xbearing for a engagenient with athe boiler ishleet mf a Irelati-vely esofte-r fimetal whereby to cushion the: bolt eagainst v flexing strains.

12. -A- stgay-boltrhavingiavcoreof hardmetal and a -:re1ati-ve1y soft v-nietal zferrulerfor sengagenient -w-ith 2a ibOllGI sheetwseeured .upon

the core with-out threaded engagement atthe inner-end.ofrthelferrule. v

:3. ;-A---stay bolt, havingra "hard metal ;core,

iattubular I op ening'; tl'rroughithe scores a. :rela- 'tinely eSOft metal iferrule *zsadjacent' ,toteaeh end of the core securedetoithercone (Without :threaded; engagement .aat i'inner t ends of the iferrnle, xthe 'ferrules -:being' ":constructed- "for threaded engagement withq-thewboiler sheets, and the -"corewha virrg :its inner "-end 'p'roj eeti1rgsbeyond--the =softrmetal ferrule for ariveting over (the ferrule ".lIL securing the stay-boltint place.

:4. Ai stay-boltEhaving 24a char-d metal :core, I

a f tubular op ening th-rouglr the core, ea relatively soft metal -ferrule adjacent to reach end: IOf-fbhQ "core secured tO'vtlIe': core without :thre'aded engagement at the": inner ends ofthe -i against at fian'gecofthe ferrule.

gagernent with the tboil'er sheetyan'd Fain-"lit 1 having threaded engagement with {the more adapted'to icompress theferrule;

. l nstay bolthaving acore of'hardimetal of -:-a' length greater than ithe :distance thetween the boiler sheets, a shouldered soft gagement with a boiler sheet, said ferrule metal ferrule on the core adapted for enhavingthreaded engagement at its outer end 10 gagement With a sheet, and a nut having only with the core and the remaining conthreaded engagement with the core and tacting portions of the ferrule and core adapted to take against the shouldered porbeing relatively smooth.

tion of the ferrule. In testimony whereof I have hereunto 7. A stay-bolt having a core of hard metal signed my name. and a relatively soft metal ferrule for en- WESTON JENKINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

